Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Question
Chapter 2, Problem 2.4RQ
Program Plan Intro
Relation:
Relation is a two-dimensional table in which data is named. The relations have the named columns and numbers which denote the unnamed rows.
- Although relation is defined as the two-dimensional table of data, not all the tables are considered as relations.
- There are some properties that differentiate relation tables from non-relation tables.
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Convert the following ER diagram into a relation table.
Give an example of a table that is not a relation (other than one from this chapter).
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Chapter 2 Solutions
Database Concepts (7th Edition)
Ch. 2 - Prob. 2.1RQCh. 2 - Define the term entity, and give an example of an...Ch. 2 - Prob. 2.3RQCh. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - Prob. 2.7RQCh. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - Define the term unique key and give an example.
Ch. 2 - Prob. 2.11RQCh. 2 - Prob. 2.12RQCh. 2 - Prob. 2.13RQCh. 2 - Describe four uses of a primary key.Ch. 2 - Prob. 2.15RQCh. 2 - Prob. 2.16RQCh. 2 - Prob. 2.17RQCh. 2 - Explain the term foreign key, and give an example.Ch. 2 - Prob. 2.19RQCh. 2 - Prob. 2.20RQCh. 2 - Explain three possible interpretations of a null...Ch. 2 - Give an example of a null value (other than one...Ch. 2 - Prob. 2.23RQCh. 2 - Prob. 2.24RQCh. 2 - Prob. 2.25RQCh. 2 - Prob. 2.26RQCh. 2 - Prob. 2.27RQCh. 2 - Define the term primary key in terms of functional...Ch. 2 - Prob. 2.31RQCh. 2 - Examine the data in the Veterinary Office...Ch. 2 - Prob. 2.33RQCh. 2 - Describe a modification problem that occurs when...Ch. 2 - Prob. 2.35RQCh. 2 - Prob. 2.36RQCh. 2 - Prob. 2.37RQCh. 2 - Apply the normalization process to the Veterinary...Ch. 2 - Prob. 2.39ECh. 2 - Prob. 2.40E
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- What is an unnormalized relation? Is it a relation according to the definition of the word relation?arrow_forwardDescribe how you would deal with the relation type M:N using a practical example.arrow_forwardHere are three examples of when it makes sense to create a surrogate key in place of the primary key in a relation.arrow_forward
- What does it mean to be related? How do you define a relation's properties?arrow_forwardunder what three circumstances does it become necessary to generate a surrogate key in place of the main key of a relation?arrow_forwardCreate an unnormalized relation using student and class entities.arrow_forward
- Discuss the differences between the candidate keys and the primary key of a relation.arrow_forwardWrite relation algebra for following:Student( Enrno, name, courseId, emailId, cellno)Course(courseId, course_nm, duration)i) Add a column city in student table.ii) Find out list of students who have enrolled in “computer” course.iii) List name of all courses with their duration.iv) List name of all students start with “a”.v) List email Id and cell no of all mechanical engineering students.arrow_forwardIt is possible to construct a connection such as sec course from a group of relationships that are many to one. Does the relation's many-to-one cardinality restriction get enforced by the main and foreign key constraints? Why do you think that is?arrow_forward
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